Apparatus for plotting line graphs



L. G. TOWNSEND 2,255,835

APPARATUS FOR PLOTTING LINE GRAPHS Filed July 15, 1940 Sept; 16, 1941;

7 Sheets-Sheet l IN VEN TOR.

LEONARD G. TOWNSEND ATTORNEY Sept. 1941- L. G. TOWNSEND 2,255,835

APPARATUS FOR PLOTTING LINE GRAPHS Filed July 15, 1940 7 Sheets-Sheet 2 (F Q 0 N N I N 51E I LW I m RN a 9% a L 5 0 1 a 9 3 N g 2 9 9 s 3 r -:::::::i;

8 K N S 5 m S b R g \9 g m a) u \9 n KL 0 co R Q w o 33 \9 8 o \9 l I H 5 m N N 0 m HVVENTUR. LEONARDG.TOWW$END A TTORNE Y Sept. 16, 1941. L. e. TOWNSEND 2,255,835

APPARATUS FOR PLOTTING' LINE GRAPHS Filed July 15, 1940 7 Sheets-Sheet 5 IN VEN TOR. Y

LEONA PD 6. TOWNSEND A TTORNEY Sept. 16, 1941. G. TOWNSEND APPARATUS FOR PLQTTING LINE GRAPHS Filed July 15, 1940 '7 Sheets-Sheet 4 INVENTOR.

LEONA RD 6. TOWNSEND A TTORNEY p 1941- L. e. TOWNSEND 2,255,835

APPARATUS FOR PLO'ITING LINE GRAP HS Filed Jul 15, 1940 '7 sheet -sheet 5 \llllllllllllflil INVENTOR.

L EON/4RD G. TOWNSEND A TTORNEY Sept. 16,1941.

Filed July 15, 1940 7 Sheets-Sheet 6 5 Mm m9 b9 INVENTOR. LEONA RD 6. 7'0 WNSEND ATTORNEY Sept. 16, 1941. 1.. G.'TOWNSEND 11 2,255,835

' APPARATUS, FOR BLOTTING LINE GRAPES Filed July 15, 1940 v '7 Sheets-Sheet 7' IN VEN TOR. LEONA RD 6. TOWNSEND ATTORNEY Patented Sept 16, 1941 UNITED STATES PATENT OFFICE (Granted under the act oi March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 6 Claims.

The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon in accordance with the provisions of the Act of April 30,1928, (Ch. 460, 45 Stat. L. 467).

This invention relates to improvements in apparatus for plotting line graphs in the form of a resultant of ordinate and abscissa factors.

Statistical practice necessitates large numbers of graphs to be drawn by laboriously plotting the same by draftsmen on finely ruled graph paper, this calling for a high degree of skill, neatness and accuracy. Such graph paper when photostatically reproduced also reproduces the undesired finely ruled grid lilies.

An object of this invention is to provide a machine which will automatically, and directly from the data sheet, accomplish the drai -ting and ruling of a line graph with ahigh degree of speed and accuracy and without the undesired finely ruled grid lines. a

With the foregoing and other objects in view, the invention resides in the combination of parts and in the details of construction set forth in the following specification andappended claims, cer.. tain embodiments thereof being illustrated in the accompanying drawings, in which:

Figure 1 is a view in front elevation of the device, showing the relative positions 01 the ordinate and abscissa cranks and scales, the graph paper carrying cylinder and a line graph described on the paper.

Figure 2 is a top plan view of the device, with thecylinder assembly removed, showing the interior mechanism for actuating the cylinder and the ordinate and abscissa scale and crank assemblies.

Figure 3 is a view in section taken along line 33 of Figure 2.

Figure 4 is a view in end elevation of the device, showing the graph cylinder and pen assembly and the driving connections therefor in dotted lines.

Figure 5 is an enlarged view in detail, similar to Figure 4, of the pen assembly.

Figure 6 is an enlarged view in end elevation of the pen assembly and driving shaft.

Figure 7 is a detail enlarged view in front elevation of the friction disc and its lowering and raising mechanism.

Figure 8 is a detail enlarged view in front elevation of the release mechanism for the ordinate dial.

F ure 9 is an enlarged detail view of the friction disc release mechanism.

Figure 10 is a view in longitudinal section taken through the ordinate scale indicator assembly.

Figure 11 is a diagrammatical view partly in top plan and partly in section, of a part of the device as modified and adapted for electrification, showing the motor drive gear transmission and clutches.

Figure 12 is a circuit diagram of the electrical system for operating the device.

Referring more particularly to the drawings, there is shown a cylinder l rotatably mounted on a shaft 2 and provided with drawing paper removably carried thereon. A ruling pen 3 is supported in a holder 4 slidably mounted in slots 5 and i in a bar 8' carrying a removable scale 'I. This permits the pen to be translated from end to end of the cylinder as it rotates and to describe a line graph, such as shown at 8, by means to be later described in detail.

As shown in Figure 1, there is provided an interchangeable dial scale composed of a debit hall. 9 and a credit half l0, separated by an ungraduated blank ll therebetween.

The ordinate crank 12 is used in setting the ratio, or resultant of the rotation of the cylinder l and the linear movement of the pen 3 and the means for driving the .two. The movement of the ordinate crank I2 is in two directions. When the crank is in its outward position it swings free or the machine and has no effect upon the operation of the device when rotated. when the crank is pushed inwardly, as shown in Figures 2 and 3, a rotation of the same will set up a ratio between the rotary movement of the cylinder and the linear movement of the pen. It is to be noted, however, that the pushing in and turning of the crank I2 does not eliect a rotation of the cylinder or linear movement of the pen, but merely sets up a ratio of movement so that when the abscissa crank I3 is rotated there is effected a simultaneous rotation of the cylinder and linear movement of the pen.

When the ordinate crank I2 is rotated the indicator hand H on the dial 9, HI and II is rotated to the left or right of the vertical indicator l5, depending upon the direction of rotation of the crank.

After the ordinate factor is thus set up by turning the crank l2 causing, for example, the indicator ll to be moved to a 2 position on the debit scale 9, the abscissa crank I3 is rotated in such a diretcion that the pen 3 will be moved the rotation of the cylinder and the linear movement of the pen there is thus formed on 1 the graph paper, a graph i1 between the major 1 grid lines I3 and I9 of the graph paper.

A reset key 23, mounted on a shaft 2|, may

be depressed to the right, and while in this posi- 1 tion the ordinate crank may be rotated so as l to bring the indicator H to a vertical position directly under the stationary indicator l5, caus- Q ing the ordinate dial 9, l3, II to also rotate until the number on the dial to which the indicator H was previously set (namely 2) is directly below the stationary indicator l5. The next, ordinate figure from the data sheet may now be plotted through the use of the ordinate crank 1 l2 and thus continued until all of the data .has

been plotted and the graph completed.

Referring more particularly to Figure 2, the ordinate crank l2, with its collar 22 is mounted j on a shaft 23 rotating in bearings 24 of the bracket 23 and bearings in the side wall 23. A

'; movement of this crank rotates the threaded An internally threaded nut 35 is mounted on 1 the threaded shaft 3| and is provided with forks I 33 and 31 supporting friction wheel 33. As shaft 3| is rotated by the ordinate crank l2 the nut 35 and wheel 33 are moved to the left or right acj cording to the direction of rotation of the crank. 1 The clutch fork 34 is moved to the left upon the 1 initial lateral movement of the crank 14 and this results in the lowering of the friction disc 1 39 out of contact with the friction wheel 33.

. The threaded shaft 3| also has special threads 1 43 meshing with and driving a toothed wheel 5 4| mounted on a shaft 42 rotating in suitable g bearings in the wall 43 and in the support 1 bracket 44. Shaft 42 is provided with a collar 45 abutting the support 44. Surrounding shaft 42 is a compression coil spring 43 hearing against 1 the support 44 and collar 41 which latter is longitudinally slidable on shaft 42 and keyed there- 1 to in a keyway 43. The collar 41 is urged'by spring 43 against a leather washer 49 and collar 53 on the shaft 42. Upon rotation of the shaft 42, and through friction between the leather washer 49 and the collars 41 and 53 the latter collar 53 tends to rotate a hollow shaft 5|. A i brake'drum 52, having a groove 53 and brake 1 shoe 54 with a collar 52', prevents turning of the hollow shaft 5| by reason of greater friction existing between the brake shoe 54 and the hot- 1 tom of the groove 53 in the brake drum 52. An 1 indicator hand 55 is fixedly mounted on shaft 1 42 and rotates therewith. A dial indicator 53 3 is fixedly mounted on the hollow shaft 5| and spaced from the wall 43 by a collar 51. Shaft 42 f is free to. rotate within the hollow shaft 5| except when the friction assembly 41-54 is effecj tive. Upon release of the brake shoe 54, caused y by a partial rotation of shaft 53, the brake drum 5 52 is free to follow the rotation of shaft 42 by 1 reasonof the friction clutch members 41, 49 and 3 53 under the action of the spring 43.

Mounted on a shaft 3| is a pulley 33 and also the friction wheel 33 which rotates with the 1 shaft but is splined so as to be linearly moved 1 laterally until the-pointer I3 on the pen carriage I 4 registers with the 1 on the scale 1. Due to thereon. The abscissa crank I3 is mounted upon a shaft 3|, rotating in a bearing in wall 29 and in a bearing in a bracket 32. The shaft 3| is provided with positioning collars 33 and 34 and also a pulley 35 and positioning collar 33. A worm gear 31, mounted on shaft 3| drives a worm wheel 38 mounted on a shaft 39 rotating in a bearing in the wall 43 and a bracket 13. The shaft 39 carries a bevel gear 1|, positioned by a collar 12, this gear meshing with a bevel gear 13, to bring about a rotation of the friction disc 39, by means to be later described in detail.

When the ordinate crank I2 is pushed in, the forked end of the member 14 (Figure 3) is moved to the right about its pivot 15 in the bracket 13. The left end of the member 14 has forks 15 and 13 (Fig. 9) provided with rollers 11 and 13 which rest upon a collar 19 when the machine is in normal position. Upon moving the ordinate crank |2 to the left, the collar 19 is depressed and the friction disc 39 lowered out of contact with the friction wheel 33. Referring to Figure 7, the collar 19 is mounted on a shaft 33 which carries the friction disc 39 fastened by the positioning collar 3|. Shaft 33 carries a pinion gear 32 and is lowered against the action of a coil spring 33 extending between collar 19 and bearing member 34. Pinion gear 32 is sufiiciently wide to remain in mesh with pinion gear 35 during this limited raising and lowering operation. Pinion gear 35 is mounted on a shaft 33 which rotates in a bearing in support 34. Bevel gear 13-is positioned by collar 31 on shaft 33 and meshes with bevel gear 1|. Referring to Figures 3 and '1, upon the release of the ordinate crank l2, the spring 33 expands and forces rollers 15 and 13 on the forked end of member 14 in a clockwise direction, returning the crank |2 to its outward disengaged position.

Referring to Figure 4 there is shown a belt drive assembly between the base and the head of the machine. When the abscissa crank I3 is rotated, the pulley 35, mounted on the same shaft 3|, is rotated and through the medium of the belt 33, rotates a pulley 89 which is fixedly secured to the shaft 93 which is provided with screw threads. Riding in these threads under the tension of spring 95 is a threaded half. nut 9| which, upon rotation of shaft 93, positions the pen longitudinally along the cylinder I. The pen 3 may be mounted in a holder 92 and removably held in place by spring clips 93. Provision may be made for raising and lowering the pen out of and into contact with the graph paper on the cylinder, by means of a handle 93 pivoted at 91 on the carriage 4. The member 9| is threaded to engage'the threaded shaft 93 and provides a means of positioning the carriage 4 as desired independently of the rotation of the worm shaft 93 and retained in set position by spring 95. Thus, when the shaft 93 is rotated it carries the pen assembly longitudinally.

As the abscissa crank I3 is rotated a rotation of the shaft'93'is effected and the pen assembly is linearly translated. At the same time a rotary motion is applied to the friction disc 39. This rotates the friction wheel 33 in a relationship of motion dependent upon the distance of friction wheel 33 from the center of the friction disc 39. Friction wheel 33, being splined on shaft 59, causes the latter to rotate and this rotation is imparted tothe cylinder by means of the belt 93 around the pulley 33 on shaft 59 and pulley 99 on the cylinder shaft .2.

With the machine in normal position, that is, with the pen carriage indicator I8 set at zero position on the scale 1 indicating the abscissa factor; the graph paper positioned on the cylinder, the ordinate crank I2 may be rotated until the indicator I4, the reset key 28 and the ordinate scale 9, III, II are in the position shown in Figure 1,

the following is a typical operation of the device in the plotting of an analysis chart. The drawing paper may be ruled with major grid lines corresponding to the divisions of the machine scales as indicated in Figure 1. Since the ordinate scale is divided in half, the origin line of the graph paper appears in the center of the sheet, to be considered as zero, and the ordinate figures thus progress numerically from this origin line.

As for example, in computing scales, we assume the minimum amount of the chart shown to be a minus $20.00 and the maximum a plus $20.00, the operator mentally adds a cipher to each number appearing on the ordinate scale. Thus 1 becomes 10, "2 becomes "20, etc. Assuming the problem to involve the scale of $20.00 worth of merchandise, the operator pushes in and rotates the ordinate crank I2 until the indicator I4 points to numeral 2 on the debit side 9 of the ordinate scale.

In order to cause ordinate crank I2 to function, it was first pushed in to the left to engage the clutch collars 32 and 33 and the fork on crank member I4 lowered the friction disc 39 against the action of spring 83 as previously explained. The ordinate crank I2 is now rotated which turns the shaft 3|, causing nut 38 to position the friction wheel 38 at twice its diameter to the left of the center of the friction disc 39. The positioning of friction wheel 38 in relation to the friction disc 39 merely sets up aratio of movement between the same. The rotation of shaft 3I meshing with the worm 48, rotates the worm wheel H on the shaft 42, which rotates the indicator hand 55, while the dial 88 on the shaft 42 remains stationary.

The abscissa crank I3 is now rotated and the worm 81, engaging with the worm wheel 88 on the shaft 89, causes the bevel gear II to rotate the bevel gear I3 on the shaft 88. Pinion gear 88 rotates the pinion gear 82 on the shaft 80, raising the friction disc 39 under the action of spring 83 as the ordinate crank I2 is released at the completion of the ordinate setting operation. The friction disc 39, being in contact with the friction wheel 38, causes it to rotate at a 2 to 1 ratio. Since the friction wheel 38 is mounted by means of a spline, or key-way, to shaft 89, the latter is thus rotated. As the pulley 80 on shaft 59 is rotated the belt 98 rotates the pulley 99 causing a rotation of the same shaft 2 that bears the graph cylinder I. As the abscissa crank I3 is rotated, it also rotates the pulley 88 as well as pulley 89-, through the belt 88. The pulley 89 being mounted on the worm shaft 99, a longitudinal movement is imparted to the carriage assembly 4. The carriage assembly 4 carries the inking pen 3 and moves the same in a longitudinal direction, in relation to the graph cylinder. Since the graph cylinder is also rotating and the pen is drawing a line, such a line represents the resultant of the movement of the rotation of the cylinder and the longitudinal movement of the pen assembly.

Upon the completion of this last operation, the reset key 20 is now depressed, causing a counterclockwise movement of the lever 88 about its pivot 2I in the bracket 2 I and a resulting release of brake shoe 84 from contact'with brake drum 82 against the action of spring I08 tending to hold crank 88 against the arm IIlI pivoted at I02 to a base member I03, the arm IIII carrying the brake shoe 84. The ordinate crank I2 is now rotated in a direction-opposite to that which was necessary to position the indicator hand I4 to the number 2 on the ordinate dial. The ordinate crank I2 is rotated until the indicator hand I4 is positioned under the fixed indicator I8 and, due to the release of braking shoe 84, the dial 88 follows the movement of this hand I4 until the figure "2," on the debit side of said dial, being positioned directly under the point of the indicator, is also positioned under the fixed indicator I8. The machine is now completely reset and ready for the next ordinate factor to be plotted.

Ordinate crank I2 is again pushed in and rotated until the indicator hand I4 has moved one division to the right of the indicator I8. Since the ordinate dial 9, III, II has moved two divisions I to the left, by reason of the last operation, the indicator hand I4 is now positioned over numeral 3 on the debit side 9, of the dial. The abscissa crank I3 is now rotated and an action, similar to that previously described, takes place. next factor has been plotted on the graph and the reset key is now depressed, and the ordinate crank I2 is rotated until the hand I4 and the dial 9, I0, II move to a position where the indicator I5, the numeral 3, on the debit side of the dial, and the indicator hand I4 are all in line.

The next number to be plotted is a plus 10," and as this number is less than 30,- the ordinate crank I2 is rotated in the opposite direction to move the indicator I4 to the 1 position, two

divisions to the left of the indicator I8. This brings the friction wheel 38 to a position equal to its diameter to the left of its diameter to the left of the center of the friction disc 39.

As the abscissa crank I3 is turned, the next line of the graph changes its direction due to the change in direction of rotation of the friction wheel 38, and drops toward the origin line of the graph.

When the machine is again reset the debit 1 is positioned under the indicator I8 and under the hand I4. If the next factor to be plotted is a credit of minus "20 the hand I4 is moved by the ordinate crank I2 three spaces to the left of indicator I4, or to the credit 2 position. This positions the friction wheel 38 to the right of the center of the friction disc 39. As the ordinate crank I2 is rotated, the pen 1 assembly is moved from the 3 to the 4 position of the abscissa scale, and the cylinder rotates so that the resulting line is drawn below the center, or origin line, of the graph paper to indicate a minus $20.00.

From the sample operations disclosed above, it will be readily understood that any figures from the maximum to the minimum, first decided upon, may be plotted. Although even numbers have been chosen for the illustration, each division of the ordinate or the abscissa scale may be understood to be made up of as many smaller divisions as necessary. In other words, the elasticity of the device is dependent only upon the ability of the operator in estimating correctly division points between the major divisions of either scale.

As both the abscissa and the ordinate scales are removable and replaceable, it may be readily seen that other scales may replace those indicated The in the accompanying drawings. For instance, instead of the conventional credit and debit scale illustrated in Fig. 1, such ordinate scale may be substituted for a complete credit or debit scale having twice the capacity of the scale shown. In a similar manner, the abscissa scale may be replaced with a scale reading from to 30," representing the 30 days in a month, from 0 to 7. representing the days of the week, on any other type of scale which satisfies the conditions of the graph being drawn. It will also be understood that the ordinate scalemay be replaced by a logarithmic scale when necessary. Alogarithmic scale may also replace the abscissa scale if it is found expedient to do so.

The drawing paper used on the graph cylinder may be either pre-printed with the major grid lines or such major grid lines may be actually drawn by means of the pen by properly setting up the machine. Should it prove desirable, all major grid lines, and other markings may be eliminated completely from the graph paper, since the operation of the machine does not depend upon any identification lines on the graph paper.

For rough or practice graphs, the pen may be substituted by an ordinary pencil and sample graphs made very quickly in this manner.

For purposes of simplicity, this invention has been described in its simplest elements. It will be understood, however, that other machines known to the art, may be connected either directly or indirectly, to this machine with results satisfactory to both. It will be further understood that such a machine as herein described, adapts itself very readily to the incorporation of; anumerical key-board and motor drive, and that with such an adaptation, each of the several cycles of operation of the machine may follow each other logically, from the first depression of a key by the operator, to the final reset operation of the machine and the returning of the key, once more, to its normal position. Various other forms of friction clutches, etc., than those shown, may be used in this machine and it is intended that they shall fall within the scope of the claims in this disclosure.

In Fig. 11 is shown motor II8, which is capable of being reversed by control through leads I24, I25, I28 and I21. This motor is equipped with worm wheel I28, mounted on shaft I28. This work wheel drives the gear I30, mounted on shaft I32, by collar I3I. Shaft I32 is positioned between bearing members I33 and I34 by means of collars I35 and I38. Mounted on shaft I32 is a clutch plate I38, by means of collar I31. Clutch plate I38 contacts leather friction washer I38, which tends to impart motion .to clutch plate I40, mounted on and integral with shaft I88. Pressure spring I 4| mounted on shaft I88 exerts pressure between bearing member I13 and clutch plate I40. Also mounted upon shaft I 88 ispinion gear I42. Pinion gear I42 simultaneously meshes with pinion gears I43 and I51. Pinion gear I43 is mounted upon shaft I44, operating in bearing members I13 and I58. Also mounted upon shaft I44 is sliding clutch member I48. Collars I45 secure this member to shaft I44. Pinion gear I41, and clutch member I48, with extension collar I48, and collar I43 bearing contact tooth I50, are all slidably mounted upon shaft I 44.

Clutch fork I8I engages the slots in clutch member I48, and positions said member in a longitudinal direction. Integrally mounted upon shaft I44, by means of screw I53 is collar I52,

bearing contact tooth m. When clutch fork I8I i moved to the left, it carries with it clutch member I48, collar extension I48, collar I48,

and contact tooth I50, so that contact tooth I50 is intercepted by rotating contact tooth I5I, which causes clutch assembly I50, I48, I48, I41 and I48 to revolve. Upon the'rotation of pinion I41, such rotation is also imparted to pinion I54,

mounted upon shaft 8I. 'Shaft 8| is free to,

rotate in bearing members I88 and I88. In a similar manner, pinion I81, mounted upon shaft I88, rotates collar I88 with contact tooth I81, made Integralwith aforesaid shaft by screw I88. When clutch fork I82 is moved to the left it forces clutchmember I80, mounted upon shaft I58, by means of collars I88, to carry with it pinion I83, collar extension I84, collar I88, bearing contact tooth I88. When contact tooth I 88 and contact tooth I81 engage, motion is imparted to clutch assembly I88, I85, I84, I83, I and I88. Pinion gear I83 imparts its rotation to pinion gear I10, mounted upon shaft 3|, which bears worm wheel 40, clutch members 32, 33, 34,

collar 22 and crank I2. This shaft rotates in bearing members "I, I56 and I13. Worm wheel 40 mounted upon shaft 3|, imparts a rotary motion to gear 4I, mounted upon shaft 42. Clutch fork 34 is integral with crank 14, pivoted at pivoting point 15, which is fastened to anchoring member 16. Crank 14 is utilized for lowering friction disc, as explained completely in connection with description in Figures 1 to 10, inclusive.

When crank I2 is moved to the left the toothed members of a clutch 32 and 33 are engaged. This engagement makes it possible for a rotary movement of crank f 2 to be transmitted to gear I10 and worm wheel 40. When crank I2 is moved to the left, it also results in a partial rotary movement of crank 14, about pivot 15. The left hand extension of crank 14 forces back latch I14 until it latches. At this point the extension of crank 14 is latched in a downward position by latch I14, which pivots at point I18, of base member I19. Electromagnet I11, upon being energized through leads I 15 and I 18, withdraws latch I14, thus allowing crank extension member 14 to assume its normal position. Control button I80 mounted upon pin I82 serves to reset the machine by carrying with it, when depressed, stud I 8|, mounted upon pin I82, and contact I81, mounted in insulating block I85, in conjunction with other contact members I88. Contact members I88 and I81 are supplied with current through leads I83 and I84. Crank 58, pivoting in base member 2i, at pivoting point 2I, is depressed simultaneously, and as a consequence of depression of reset button I80. When crank 2I is depressed it tends to move crank member IM to the right as crank member IN is pivoted at pivoting point I 02 of base member I03. Tension spring I00, fastened to base member 2| at stud 10, and also at its upper end, to crank 58, serves to keep aforesaid crank 58 in contact with crank IOI. The tension of spring I00 is less than the tension of the retracting spring operating on member IOI.

In Fig. 12 is shown reversible motor II9,

equipped with clockwise direction binding posts positioning. Batteries 199 and 209 serve as a source of current supply. K

Electromagnet-lfl serves to attract armature 241 to a position so that latch 114 unlatches crank extension member 14 (shown in elevation in F188- 11 and 3). Tension spring 228 serves to return latch armature 241 to a latched position when released by magnet 111. Tension spring 226 is held by anchor member 229 to the bed of the machine. Latch armature 241 is pivoted at pivoting point 118. The release and retention of crank extension member 114 serves to raise or lower friction disc shown more clearly in Figures 2 and 3. I

Electromagnet 231 serves to attract clutch armature 246 to an engaged position. Clutch fork 161 is shown in top view of Fig. 11. Tension spring 233, anchored to frame 232, serves to return clutch armature to its normal position when magnet 231 is not energized. Clutch armature 246 is pivoted at pivoting point 231.

Electromagnet 196 serves to attract clutch armature 234 to a position so that clutch fork 162 (shown in top view in Fig. 11) engages clutch in an operating position. Clutch armature 234 is returned to its normal position by tension spring 249, which is anchored to base member 235. Clutch armature 234 is pivoted at pivoting point 236.

Electromagnet 203, when energized, attracts relay armature 204 to a position where it is latched by member 205, pivoted at 238. When relay armature 204 is in latched position, contacts 239 and 240 are closed. Relay armature 204 is pivoted at pivoting point 241.

Electromagnet 206, when energized, serves to attract armature 205, pivoting at pivot point 238, and thus releases relay armature 204 so that said relay armature may return to its unlatched position.

Abscissa scale 1 is equipped with a slotted bar 248, which permits the insertion of tabulating stop members familiar to the art. These tabulating stop members are shown in 220, of Fig. 12. When these tabulating stop members are inserted in one way, they are flush with top of slotted bar 248. When they are inserted another way, they protrude a trifle above the bar, or just enough to intercept and close the slide contact 219, and the electrical contacts 218. These contacts are connected to leads 216 and 211, respectively, which lead to contact springs 213 and 215. The contact springs 213 and 216 are supported on the carriage assembly, shown in Fig. 12, and slidably contact metal bars 211 and 212. Metal bars;211 and 212 are insulated from one another and mounted in support bar 222, Fig. 12. It will be apparent that, when a tabulating stop 220 is raised that it will result in the closing of contacts 216. The closing of these contacts completes the circuit from the battery 209, through the electromagnet 206, through the leads 201 and 208, and bars 211 and 212,'the sliding contact members 213 and 215, the leads 216 and 211, and the contacts 218.

In operation, the motor 119 is not in motion at the start. Ordinate crank 12 is moved to the left, or engaged position, and thus lowers friction disc 39 from contact with friction wheel 38 as described above. The extension of crank member 14 is held in the latched position by means of latch 114. Ordinate crank 12 is now rotated until the desired number is beneath the indicating hand of the ordinate dial. This rotation results in the positioning of cams 193 and 214 to either Cats the right or the left, depending upon the direction of rotation of ordinate crank 12. We, will suppose that crank 12 has been rotated to the right, or in a clockwise direction. Cam 193 will now have raised, with itshigh point, sliding member 192 of contact arm 189, and thus closed contacts and 191. point on the other side has not raised contact arm 226 to a position where contacts 223 and 224 are closed. The results of the closingof contacts 190 and 181 will be described more completely when the reset circuit is taken into consideration.

With the carriage assembly positioned at the left, or starting position of the graph paper, starting button 201, Fig. 12, is now depressed. Current from the battery 199 flows through lead 200, key 201, lower key contact 230, lead 202, electromagnet 203, lead250, lead 243, and back to battery 189.

When magnet 203 was energized, contacts 239 and 240 were closed, thus establishing a circuit from battery 199 through lead 200 to contact 240 and contact 239 to lead 244 and through magnet 231 and lead 245 through magnet 111, to lead 121 and into motor 119, through binding post 123. Current now flows through motor 1 19, urging it in a clockwise rotation, because of the return of current through terminal 122 and lead 126, to lead 248 and back to battery 199.

When magnet 231 was energized it attracted the armature clutch arm 246 to an operatingposition. The engagement of the parts of the clutch assembly, as described hereinbefore, re-

' sults in the movement of shaft 61, Fig. 11. Shaft 61 is directly connected with the abscissa crank as shown and described hereinbefore. The movement of this shaft results in the movement of the carriage assembly in a longitudinal direction, to the right.

The energizing of magnet 111 results in the unlatching of crank extension member 14, Fig.

Cam 214, having its high 11, and thereby allows the friction disc 39 to contact friction wheel 36.

As the carriage assembly 300 (Fig. 12) moves to the right, contacts 218 are open. Carriage assembly 300 moves to the right until a tabulating stop member 220, in a raised position, closes contacts 218 because of contact between tabu-' lati'ng'stop member 220 and sliding shoe 219. Current is now allowed to flow from battery 209, through lead 210, to contact bar 212, to contact slide spring 215, to contact 216,, contact 211, slide contact'spring 213, contact bar 2, lead 208, to magnet 206. Through magnet 206 to lead 201, and return to battery 209.

When magnet 206 is energized, it attracts armature latch arm 205 and thus releases armature contact arm 204 from its latched position. When armature contact arm 204 is released, it breaks contacts 239 and 240, thus releasing clutch assembly, 32-33, and stopping the carriage assembly from further advance.

When magnet 111 is de-energized, it releases latch arm 241 to a position to engage crank extension arm 14 at the beginning of the next cycle of operation.

When contacts 239 and 240 are broken, by the above action, the motor 119 is stopped from its is the reset function.

When the reset key I90 is depressed, current flowing from battery I99 passes through contacts I98 and I96, lead I9I, magnet I96, lead I96, lead I15, contacts I90 and I9I,lead I69, lead I2'I, through motor in a clockwise direction of rotation, lead I26, lead 243, and back to battery I99.

Magnet I96, being energized, attracts armature clutch member 234 to the left so that shaft 3|, Fig. 11, is rotated. Worm wheel 40, meshing with pinion 4I, causes said pinion to rotate, and also turn. shaft 42, bearing cams I93 and 2. Cam I93 rotates until slide contact shoe I92 drops into low position of cam I93, thusbreaking contact between contacts I90 and I9I and stopping the motor. Magnet I96 is, at the same time, de-energized, returning the clutch assembly to its normal, uniatched position.

By means of the above sequence of actions, the ordinate indicator I4 is returned to a vertical position although the dial is left in its last position because of the braking action caused by the depressing of the reset key pin I62, Fig. 11,

oni brake assembly I00, IOI, I02, 2I and 2|.

Such assembly being shown in greater detail in Figs. 3 and 7. coincidentally with the depression of the reset key extension I9I, Fig. 11, contacts and depresses crank extension arm 14, and thus lowers friction disc 99 from contact with friction wheel 38, as hereinbefore explained.

If the crank I2 had been rotated in a counterclockwise direction, cam 2 would have been positioned so that its high point would have closed the circuit between contacts 223 and 224, while cam I93 would have left contacts I90 and I9I separated, or in an open position because of the contact shoe I92 being positioned on the low face of cam I93. With cam 2 in this position, current now flows from battery I99 through lead to contacts I98 and I86, through said contacts to lead I91, through magnet I96, lead, I95, lead.

25I, contacts 229 and 224, lead I24, to motor binding post I20, through motor H9 in a counterclockwise rotary direction, from motor binding post I2I, lead I25, lead I16 and back to battery return circuit I99. The motor would, in this way, revolve to the left and thus position the ordinate dial indicator hand to a vertical position, from a position to the left of said vertical position.

I claim:

1. In a device of the character described including a record bearing assembly and an inscribingj assembly, means for establishing the relationship between two factors, said means including driving and driven rotatable members, said driving member being adjustable into and out of engagement with said driven member and said driven member being adjustable so as to vary the ratio of rotation between said driving and driven members, said driving member being adjustable so as to be disengaged from said driven member while said driven member is being positioned to alter the ratio of rotation between said driving and driven members, and said driving member being adjustable to reengage said driven member after said ratio of rotation has been established, and means for registering such relationship, through the simultaneous movements of said recgr. ,h paper. The next action to be described.

0rd bearing andinscribing assemblies, in the form of a plotted line graph.

2, In a device of the character described including a record bearing assembly and an inscribing assembly, means for establishing the relationship between two factorsysaid 'means including driving and driven rotatable members, said driving member being adjustable-liteand out of engagement with said driven member and said driven member being adjustable was to vary the ratio of rotation between said driving and driven members, said driving member being adjustable so as to be disengaged from said driven member while said driven member is being positioned to alter the ratio of rotation between said driving and driven members, and said driving member being adjustable to reengage said driven member after said ratio of rotation has been established, and means for registering such relationship, through the simultaneous movements of said record bearing and inscribing assemblies, in the form of a plotted line graph, said driven member being mounted on a rotatable screw threaded shaft, a single crank having a shaft and clutch device for releasably coupling said shaft with said screw threaded shaft whereby, when said clutch device is effective, a rotation of said crank effects an adjustment with relation to the center of rotation of said driving member, said driving member being connected, by means of a pivoted member, to said shaft of said crank whereby a longitudinal movement of the latter, so as to engage said clutch device, effects driving engagement between said driving and driven members.

3. In a device of the character described including a record bearing assembly and an inscribing assembly, means for establishing the relationship between two factors, and means for indicating the same, said means comprising a fixed indicator, a movable dial and pointer, clutch means for effecting dependent and independent associations of movements of said dial and pointer, the independent movement of said pointer indicating, with respect to said dial, the relationship between said two factors, the dependent movement of said pointer and dial, in relation to said fixed indicator, indicating the setting of the device for the next plotting operation, and

vary the ratio of rotation between said driving and driven members, and means for registering such relationship, through the simultaneous movements of said record bearing and inscribing assemblies, in the form of a plotted line graph, a single means for effecting the simultaneous movement of said record bearing and inscribing assemblies, said inscribing assembly being driven directly by said means and said record bearing assembly being driven through and controlled by the operation of said adjustable driven member when positioned to effect said ratio of rotation.

5. In a device of the character described including a record bearing assembly and an inscribing assembly, means for establishing the relationship between two factors, said means including driving and driven rotatable members, said driving'member being adjustable into and out of engagement with said driven member and said driven member being adjustable so as to vary the ratio of rotation between said driving and driven members, and means for registering such relationship, through the simultaneous movements of said record bearing and inscribing assemblies, in the form of a plotted line graph, a single means for eflecting the simultaneous movement of said record bearing and inscribing assemblies, said inscribing assembly being driven directly by said means and said record bearing assembly being driven through and controlled by the operation of said adjustable driven member when positioned to efiect said ratio of rotation, said inscribing assembly having an inscriber and carrying an indicator and movably mounted on a fixed scale.

6. In a device of the character described including a record bearing assembly and an inscribing assembly, means for establishing the relationship between two factors, and means for indicating the same, said means comprising a fixed indicator, a movable dial and pointer, clutch means for effecting dependent and independent associations of movements of said dial and pointer, the independent movement of said pointer indicating, with respect to said dial, the relationship between said two factors, the dependent movement of said pointer and dial, in relation to said fixed indicator, indicating the setting of the device for the next plotting operation, and means for registering such relationship, through the simultaneous movements of said record bearing and inscribing assemblies, in the form of a plotted line graph, means for electrically and automatically effecting said setting, said means comprising LEONARD G. TOWNSEND. 

